Geology
The Champlain Valley is the northernmost unit of a landform system known as the Great Appalachian Valley, which system stretches from Quebec to Alabama. The Champlain Valley itself is a physiographic section of the larger Saint Lawrence Valley, which in turn is part of the larger Appalachian physiographic division.
It is one of numerous large lakes in an arc from Labrador through the northern United States and into the Northwest Territories of Canada. Although it is smaller than the Great Lakes of Ontario, Erie, Huron, Superior, or Michigan, Lake Champlain is a large body of fresh water. Approximately 1,269 km2 (490 sq mi) in area, the lake is roughly 201 km (125 mi) long, and 23 km (14 mi) across at its widest point. The maximum depth is approximately 400 feet (120 m). The lake varies seasonally from about 95 to 100 ft (29 to 30 m) above mean sea level.
Read more about this topic: Lake Champlain